Chemical elements
  Gold
    Isotopes
    Energy
    Production
    Extraction
    Application
    Physical Properties
    Chemical Properties
      Aurous fluoride
      Aurous chloride
      Aurous bromide
      Aurous iodide
      Aurous oxide
      Aurous sulphide
      Aurous thiosulphate
      Aurous Derivatives of Nitrogen
      Aurous cyanide
      Potassium aurothiocyanate
      Ammonia and Aurous Halides
      Gold dichloride
      Gold dibromide
      Gold monoxide
      Gold monosulphide
      Gold monosulphate
      Nitride of Bivalent Gold
      Auric chloride
      Aurichloric Acid
      Auric bromide
      Auribromic Acid
      Auric iodide
      Auri-iodic Acid
      Auric iodate
      Auric hydroxide
      Auric sulphide
      Auric sulphate
      Acid auryl sulphate
      Auric selenide
      Auric selenate
      Auric telluride
      Gold and Nitrogen
      Auric nitrates
      Gold and Phosphorus
      Gold arsenides
      Auric selenide
      Auric antimonide
      Auric cyanide
      Salts of Auricyanic Acid
      Double Salts of Auric thiocyanate
      Gold carbide
      Gold and Silicon
    PDB 1a52-4acl

Auribromic Acid, HAuBr4






Solutions of auric bromide and of gold in bromine-generating liquids are converted by hydrogen bromide into a solution of auribromic acid. The substance is also formed in solution by the action of the same reagent on a solution of auric chloride, and can be extracted by ether from the dark-red liquid. Evaporation of the concentrated aqueous solution yields the acid in dark-red crystals of the formula HAuBr4,5H2O or HAuBr4,6H2O, melting at 27° C. in its own water of crystallization, and decomposed by concentrated sulphuric acid at 155° C. into aurous bromide and bromine.


Potassium auribromide, KAuBr4

Potassium auribromide, KAuBr4, is produced by the action of bromine on gold and the equivalent proportion of potassium bromide. On evaporation of the solution, potassium auribromide crystallizes in dark-red prisms containing two molecules of water of crystallization; and by drying the crystals over phosphoric oxide it is obtained in the form of purple-red, monoclinic crystals free from water. On exposure to air, it takes up two molecules of water. Its solubility at 15° C. is 19.53 grams in 100 grams of water.

Ammonium auribromide, NH4AuBr4

Ammonium auribromide, NH4AuBr4, is produced by the action of ammonia on the acid, and forms bluish-black crystals of fat-like lustre. The anhydrous rubidium and caesium salts give prisms of metallic lustre, the colour of the first being cinnabar-red, and of the second deep black.

Other Auribromides

Auribromides of sodium, barium, zinc, manganese, and magnesium have been prepared. Triple bromides of gold, silver, and rubidium (or caesium) have also been described. Double compounds of auric bromide and phosphorus derivatives can be obtained by methods analogous to those employed for the corresponding chlorine addition-products.
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